I agree with everything you say. However, everything you mentioned about how Amazon could act in the future is speculation. I agree that when / if they start raising prices they should be considered a monopoly and heavily scrutinized and possibly regulated. But at this point, there is no justification in doing that as they haven't crossed that line.

I feel like a lot of people jump to attack Amazon on the basis of what they could do (because they're so big) instead of what they're doing currently.